Air filter



Dec. 3, 1929. N, T, HlEsTER y 1,737,587

AIR FILTER Filed Aug. 24, 1927 @ttor we q Patented Dec. 3, 1929 UNITED sf-T'Arss NORMAN T. HIESTER, OE DAYTON, OHIO am FILTER Application Jed August 24, 1927. Serial No. 215,231.

l iMy invention relates to explosive engines,

body havin g rather thick porous walls formed y by two concentric screen cages between which is interposed a packing of fibrous material, such as upholstering' hair, cotton, jute, asbestos, or other material capable of .permitting the passage of' air therethrough but adapted to intercept dust and dirt particles which may be carried by the air currents. Such body is provided at one end with a tubular neck comlinuuicating,r with the interior of the hollow filter unit and connecting at its opposite end with the air intake port of a carburetor or fuel vaporizer, or the like. The area of the filter walls of the unit is very much greater than the area of the air intake port to which the filter is connected thereby insuring' a free fiow of air under the influence of engine suction even after long periods of use during which 3o the filter body may be partially clogged by collected dust and dirt.

The object of the invention is to lsimplify the structnre, as well as the means and mode of operation of such air filters whereby they will not only be cheapene'd in construction,

but will be moreefcient in operation, uni.-

orm in action, of increased capacity, capable of long periods of use without the necessity for cleaning, and unlikely to get out of repair. y

40 A further object of the invention is to provide an improved form of tubular filter bodies and to provide a support therefor which will prevent disarrangement or distortion of the filter body by vibration incident to its use upon an automobile. With the above primary and other incidental objects in view, as will more fully appear in the specification, the invention consists of the features of construction, thev parts and combinations thereof, and the mode of operation, or their e nivalents, as hereinafter described and set forth in the claims.

Referring to the accompanying drawings wherein is shown the preferred but obviously' not necessarily the only form of embodimentof the invention, Fig'. 1 is a sectional 'view of' the air filter forming the subject matter hereof applied to a fuel vaporizer with which is connected the carburetor and fol-Illing the fuel supply system of a motor vehicle engine. Fig'. 2 is a side elevation of' the air filter. Fig'. 3 is a bottom plan View of' the assembled filter with the lower head removed. l

In the accompanying drawings, 1 indicates the intake manifold of an explosive engine, of e5 .which 2 is the exhaust conduit. This exhaust conduit is provided at one side with a chamber 3 connected at its lower end with a carburetor 4. At is upper end this chamber com iiuinieates through a conduit 5 with the va- 70 porizer 6. Air is supplied to the carbu retor 4 through a conduit 7 communicating' through the vaporizer with the air inlet port 8. 'lhevaporizer isprovided with an ai r inlet port 9 controlled by abutterfly ordainper 75 valve 10. Ordinarily this inlet port!) is open to atmosphere and freely admits dust or dirt which may be carried into the vaporizer 6 and thence into the engine with the il'woming current of: air. The construction thus far described forms no part of the present ,invention but is shown and described merely as a typical installation with which the present air filter' is to be. associated. It will be understood, however, that the air filter forming' the g3 sub'ect matter hereof is not limited `to use with suchhot plate type of Vaporizer', but may be applied directly to the intake port of the ordinary carburetor as employedat the present timeon'motor vehicles. no The air filter comprises two concentric spaced screen wire cages 11 and 12, provided at their opposite ends with imperforate headsV 13 and 1 4. Interposed between thescreen `wire cylinders or cages 1.1 and 12V is abody 95 15 of filter .materiab This filter body 15'i`s preferably a body of matted hair, such as is usedlfor upholstering purposes. However, other porous or fibrousvmaterial may be substituted for the bodyofA hairnf This filterfbiody l 15 forms a cylindrical wall ofi-considerable thickness, enclosing therein a chamber 1.6. The'screen wire'cylindersll and .'12 are held inposition andthe body 15 of filter material -confinedjtherebetween'by being clamped bev r`,tweenthe opposite "heads 13 and 14.v The upper head-13 is provided' with a central eningjto' receive `one end of atubular neck o 1 vthe opposite end of which is insertable vwithin the air inlet `port 9 ofthe -vaporizer,

or carburetor as the case may be. This tubul, lar neck 17 `is shouldered as at 18 and 19 to l 'limit its-,insertion within` the opening of the head 13 and the port 9 'of the vaporizer. Electrically lWelded or/otherwise attached to the tubular neck 17 is a dependent stirrup 20 extending within the', chamber 16 'of the filter. The lower -head 14 is; centrally'perforated to y receive a screwy 21 which engages with the dependent stirrup 2Q to draw the assembled parts together. The peripheral flange or shoulder `190tthe tubular neck 17 bearing .up on the head 13 at onelendofthe unit and .thescrew .21 ,engaging the opposite end of the unit Tserve to clamp the filterbod 15 i and-its confining cylindrical screen -wa s 11 y and '1,2 therebetween.` The filter unit is supvinfalli ht 011 whic lattraction of the lter bodyV or particles of dust and effects their adherence thereto. 'The ported' upon the vaporizer 6 or upon thev y carburetor by hook arms 22,. preferably of -so spring wire. The lower ends of these arms aremturned for engagement 1n suitably positioned holes 23 in the side wall of the tubu lar neck 17, while the upper ends are bent 'to arcuate fornito engage in overlapping relation with the'vaporiz'er` 6.l The filter unit is preferably, though not necessarily, dipped materiall increases the surface areaof a cylindrical filter body 15 is very much greater than thecross sectional area of the tubular neck 17 or inlet port 9 of the v aporizer. Consequently only a small' portion of. such area is necessall'y the required quantity of air. n

to supply itially the v air will be supplied through the first or topmost zone of the cylindrical -lter wall. As

such-p ortiono'f the wall becomes clogged or more or less obstructed by the accumulation of dust and dirt the'air suppl will be drawn through a gradually deseen ing zone until the bottom of the unit is reached. Thus the device may be continued in operatioufor a long'period of time .beforefcleansin or rejuvenation becomes necessary. This 1s easily and quickly effected-b immersing the unit in gasoline which was es thev dust and dirt 'A accumulation therefrom after which it isI again dipped in a light oil Ypreparatory -to another extended period of usefulness.

From' the above description it will bel apparentthat there is thus provided a device'- of the character described possessing the particular -features ofvadva'ntage before enumer- 'ated desirable, but whichobviously is susceptible of modification in its form, proportions, detail construction and arrangement of parts without departing from the principle involved or sacrificing any of its advantages.

y While in order to comply with the statute the inventionhas been described inv language.

. more or less specific as to `structuralfeatures it is to .be understood that the inventionl is not limited to the specific details shown, but that the meansand construction herein disclosed comprisesthe preferred form of several modes of'putting the invention into ef-4 feet, and the invention is, therefore, claimed.

in any of its Aforms or modifications within the legitimate and valid scope of the -appended claims. f

Having thusdescribed my invention, I

1. An air'filter ofthe character. described, I

including two circular spaced heads, marginal flanges projecting from the inner faces y centric opening therein, a` pair of concentric vperforate cylinders interposed betweenl the heads, the endsfof the outer cylinder being enclosed within the marginal flanges of the heads, a tubular neck portion having periph-y eral beads'in spaced relation-.with its. ends,-

vone end lof theneck being eztended into the opening of said open head the extent of insertion being'limited byone of said peripheral beads, the other end of theneck portion being for insertion in the orifice of an airl 'of said heads, oneof the heads having a conconduit toj the limit defined bythe other l peripheral bead, said'neck and 'opening in the head being of somewhat less dimension than .the inner perforate cylinder, a U-shaped stirrup attached 'to the neck portionfand extending withinthe inner cylinder, means for-detachably engaging the stirrup with the head at the end of the structure opposite the neck, attachment means carried-by the neck f portion and adapted to engage the air intake conduit, and a body of fibrous filter material interposed between. the cylinders.

2.. An air filter of the character described v including a cylindrical hollow filter body, means `for retaining the body in its cylindrilcal-hollow form, terminal marginally flanged heads for saidbody 'having their flanges in,4 turned toward each other and overlapping` the cylindrical body, one ofthe heads having` )therein a concentric opening, a tubular neck A NORMAN T. HmsTER. 

